BNP leader Nick Griffin is to lodge a formal complaint and freedom of information request to the BBC over the way his appearance on Question Time was handled.

He will argue that the format of the show was skewed to focus almost solely on the BNP, not wider issues, that the makeup of the audience was primarily anti-BNP and that a broader range of questions were not fielded, a spokesman for the party said.

BBC online forums were flooded with support for Griffin and attacks on the BBC, the other panellists and the anti-fascist demonstrators outside Television Centre yesterday. However, there were also comments supporting the BBC for its decision to invite Griffin on to the Question Time panel.

The BNP spokesman said: "He was not treated the same as other elected politicians [who appear on the show]; it was a completely unfair showing.

"Question Time changed the whole format of the programme. The BNP will be putting in a freedom of information request to the BBC and programme makers to ask about the process of changing the format of the whole programme. [We want to know] why they felt they had to break with the usual format."

He said that the BNP wanted a second outing on Question Time to be "re-run in the correct format". "If people want to be critical, fair enough – they should not dominate the whole programme."

The spokesman added that Question Time had a history of moving locations and that London was too "multicultural" to be fair to the BNP and that perhaps a location like the northwest of England would be an option.

"It is logical: that is where he was elected and an audience would contain a representative cross-section of voters, some of whom may have voted for the BNP," he said. "It would make for a more balanced programme."

Griffin is also keen to challenge Jack Straw, the justice secretary, to a one-on-one debate over Labour policies.

The media regulator, Ofcom, said it had received a "small number of complaints" about the show – understood to be less than 100 – and was considering whether to launch a formal investigation of whether Question Time breached its broadcast code.

BBC Information, the corporation's call centre, had fielded a total of 416 calls on the controversial show by about noon today. Of these, 243 were complaints of bias against Griffin.

The BBC also received 114 complaints about Griffin being allowed to appear on the Question Time panel at all. There were a further 59 calls applauding the BBC's decision to have the BNP leader on the show.

Ofcom is understood to have received fewer than 100 complaints and will now make a decision on whether to investigate. The complaints fall under the broadcasting code section on harm and offence.

An Ofcom spokesman said: "Ofcom has received a small number of complaints which are currently being assessed against the broadcasting code."

Under the BBC's complaints procedure, the corporation will respond to the calls after the issues have been discussed with the Question Time programme team. Those who remain unsatisfied with the response can refer their complaint to the BBC's editorial complaints unit.

If they are still not happy with its decision, complainants can take their grievance to the editorial standards committee of the BBC Trust, the corporation's regulatory and governance body.

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